Vat dye.



UNITED strAtrns PATENT OFFICE.

WILHELM BAUER, F VOHWINKEL, AND

ELBERFELD. GERMANY, ASSIGNORS TO ALrnnn HERRE wmnnvnonr' MAYER, or FARBENFABRIKEN VORM. rmnim. BAYER & ('30., OF ELIBERFELD, GERMANY, A CORPORATION OF GERMANY.

No Drawing.

'To all whom 'it'may concarn:

Be it known that-we,WInHnL1\ 1BAUnn,1'esiding at Vohwinkel, and Annnnn Hnnnn and ItoDoLnMAYim, residing at Elberfeld,- Germany; doctors of philosophy, chemists, citi; zens of the German Empire, have-invented new and useful Improvements in New Yet Dye, of which the following is a specification.

Our invention relates to the manufacture and, production or new and valuable vat dyestuffs. They are obtained by condensing isetin compounds in which theoi'zygen of the alphe-keto group is replaced by easily movable or replaceable substituents, e. gha-logen,

being by Weight: 395 parts of dibroinoisa'tin '210 parts of P01 sulfur, the amino group the alkoxy map;- with the a-cenap'hthenone of the formu a:

l Yl

H: I The new dyes are in a drystute dark 'reddish-brown crystalline powders'wlth a me "tallic luster which are soluble in hotbenzene generally with a bluish red coloration, and which yield with hydrosu'lfite and caust c soda, lye vat-sdyeing' cotton after exposure to air red-to violet shades.

'In order to illustratethe new process more fully 1 we can proceed as follows, the parts areconverted i'nto'dibromoisutin chlorid by heating it in 'a dry benzene suspension with The mixture thus ob.- tninedis then poured into a solution v'vhich is well stirred ofl75 parts of acenaphthenone in {dry benzene and-is heated forabout half an hour. The dyeis filtered ofl? and Wushed; It is a. reddish-brown crystalline powder soluble in hot benzene with a-bl'uish- 'red'land in cold sulfuric acid with a, green and in hot sulfuric acid with a blue color. By treatment! with hydros'ulfite and NuOH a" methyl-lea tin DYE.

Specification of Letters ,Patent. Patefltd Aug. 29, 1911. P Application filed September 13, 1910.

Serial-No. 531,796.

, violet vat results from which cotton is, dyed in pure fast bluishrred shades. I,

The dyestufi is probably formednocording to the following formulae;

Otlfl of the above mentioned isatin derivatives may bensed, e. g. alph'a-isa'tin' anilid; ChlOIO-, bromo-, chloro-broino or dichlcroisatin chlorid, ortho-,.b1'o1no.-pira chlorid, parnsbromdorthomcthylisatin chlorid, t-ri-bromoisotinchlorid, .ortho-methylisntin chlorid, ortl'io-para-dimethylisatin ohlorid, parabron1o-ortl1o- 7n inethylisntin anilid, para inethylisat-inalpliapara-toluidid, isutin chlorid, dibronio-betanuphthisat-in chlorid, etc.

Ir-The herein described new dyestuffs beingjcondensation products of an-isatin courp-ound in which the oxygen of the alpha-V keto grou 'a is replaced byan easily movable or replaceable substituent and uccnaphthc-c none, which dyestufi's are in a dry statcdar'k -8 0 reddish-brown crystulline powders with a metallic luster which are soluble inhot hen: "zone generally withjzi bluish red coloration,

and-which .yield with hydrosulfite flI1l,CRUS- ticsoda lyeiya'ts dyeing'cott'on after expo'' sure to air red-to Violet shades, s'uhstan-I tially as described. .1

2. The herein described neW dyestufl 'bc-r ing a condensation product of 'di'bromoisatin-ulphu-chlorid and :acenaphthenone,

is dyed bluish-red,

which dyestufi' is in a dry state a dark reddislvbrown crystalline powder, soluble in hot benzene with a bluish red and in cold concentrated sulfuric acid with a green-and In testimony whereof we. have hereunto 10 set our hands 1n the presence of two subscribmg witnesses.

WILHELM BAUER. [11s.]

iphot sulfuric acid with a blue coloration, ALFRED HERRE. [11. s.] und which yields wit-h hydrosulfite and caus- RUDOLF MAYER. [11. 5.]

tie soda lye :1 violet vat from which cotton substantially as delVitnesses CHAS. J. \VRIGHT,

scribed. ALFRED HENKEL. 

